Burglar-alarm



(No Model.)

H. FEBRS.

BURGLAR ALARM.

No. 286,598: l Patented oct. Y1e, 1883.

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NITEDT STATES HUDSON FERRIS, OF CHICAGO, ILLINOIS.

BURGLAR-ALARNI.

SPECIFICATION formingpart of Letters Patent No. 286,598, dated vOctober 16, 1883.

Application filed July 10, 1883. (No model.)

To a/Z whom it may concern.-

Be it known that I, HensonT Fnnnrs, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Burglar-Alarms; and I do hereby declare the following to be a full, clear,

and exact description of the invention, suoh as will enable others skilled in the art to which it pertains to make and use it, reference being 1o had to the accompanying drawings,which form part of this specification.

My invention relates to an improvement in burglar-alarms; and it consists in the combination of suitable side pieces, which have the combined bottom bar and spring pivoted between them, with the hammer, which has a socket for a eartrid ge and a roughened surface. for striking a match as it falls, and which has its inner end to bea-r upon the inner end 2o ofthe operating-spring, and a pivoted screw, by means of which the alarm may be fastened upon any suitable support, all of which will be more fully described hereinafter.

` The object of 'my invention is to provide a burglar-alarm which is so shaped as to be operated" by the opening of the door, 4and then to act as a wedge, so as to prevent the door from being opened any farther, and which will both sound an alarm and strike a light at the 3o same time.

Figure l is a side elevation of my invention, showing the hammer raised. Fig. 2 is a vertical longitudinal section of the same, showing the hammer closed.

shoulder, B, formed in its under side at any suitable point, andl then the bar is made thinner from this shoulder on to its' inner end, so as to form the operating-spring G. This 4o combined bar and spring is rigidly secured between the side pieces, D, which are made wedge shape, as here shown, so that they will allow the door'to be just opened far enough to set oit the alarm and then prevent the door from being opened any farther. This bottom bar has a projection, F, formed upon its top, for the purpose of exploding the cartridge, and has a socket, G, to receive a match, ta-

A represents the bottom bar, which has a ened part, and ythus be ignited. lWhen the k 6o hammer is in the position shown in Fig. 2, it exerts no pressure upon the spring; but when the hammer is raised into position its inner end bears down upon the spring to such an extent that when the hammer falls the spring acting on this inner end forces the hammer downward with force enough to explode the cartridge and light the match or taper. Between the inner end of the side pieces is pivoted a screw, O, which is to be screwed into the door or any other suitable support, and 7o thus hold the alarm rigidly in place. In using the alarm the screw will be inserted into the floor close to the door, so that when the door is being opened it strikes against the hammer and knocks it down, and then runs upon the top edges of the side pieces, which act as a wedge to prevent the door from opening any further. By this construction an alarm is given, the door is prevented from being opened, and a light struck at the same time.

Having thus described my invention, I claim- In a burglar-alarm, the combination of the wedge-shaped side pieces, the combined bottom bar and spring having a socket to hold the match or taper, and the hammer, which has its end curved and roughened so as to ignite the match or taper, substantially as set forth.`

In testimony whereof I affix my signature in 9o presence of two witnesses.

HUDSON FERRIS. Witnesses :v

"WILLIAM H. Cass, V THoMAsJ. MoGnArn. 

